Christopher Clark graphed the peak levels of and RMS levels of three hit songs a year over the past three decades. This image links to a PDF of his full poster, "A Visual History Of Loudness." Christopher Clark hide caption

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Inside Atlanta's new air traffic control tower, a dozen controllers separate arriving and departing planes. Jim Burress for NPR hide caption

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Courtesy of Apple

Even the pope has gotten into social networking on the Pope2You Web site featuring a photograph of Pope Benedict XVI on the home page. The site translates its content into English, French, Spanish, German and Italian. Pier Paolo Cito/AP hide caption

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